An Angel for Satan (1966)

In the Nineteenth Century, in Italy, the sculptor and restorer Roberto Merigi is hired by Count Montebruno to restore an ancient statue retrieved from the bottom of the lake that surrounds the village. The count explains that the statue was pushed to the lake two hundred years ago and there is a legend that it is cursed. When his nephew Countess Harriet Montebruno returns to the village after studying fifteen years in London to receive her heritage that is administrated by Count Montebruno, Merigi notes her resemblance with the statue and soon they fall in love with each other. But soon Harriet has an erratic behavior, provoking murders of superstitious locals with an evil behavior. What is happening to Harriet?